A new type of cross-coupled planar microwave filter using coupled microstrip square open-loop resonators is proposed. method for the rigorous calculation coupling coefficients three basic structures encountered in this developed. Simple empirical models are derived estimation coefficients. Experiments performed to verify theory. four-pole elliptic function designed and fabricated. Both theoretical experimental performance presented.

A miniature dual-mode microstrip open-loop resonator is proposed. Distinct characteristics of this new type are investigated using full-wave electromagnetic simulations. It shown that the two operating modes, i.e., even and odd within a single do not couple. also found there finite-frequency transmission zero inherently associated with mode. Two two-pole filters demonstrated opposite asymmetric responses, which result from different locations zero. Higher order investigated. Both simulated...

This paper presents the theory and experiment of a new class microstrip slow-wave open-loop resonator filters. A comprehensive treatment capacitively loaded transmission line is described, which leads to invention resonator. The utilization resonators allows various filter configurations including those elliptic or quasi-elliptic function response be realized. filters are not only compact size due effect, but also have wider upper stopband resulting from dispersion effect. These attractive...

In this paper, we report on the results of an investigation into dual-mode operation microstrip triangular patch resonators and their applications for designing bandpass filters. It has been found theoretically that dual modes can result from rotation superposition a fundamental mode. The characteristics mode splitting are described. new type resonator in design microwave planar filter presented. A circuit model is proposed. Two- four-pole filters demonstrated first time. Both theoretical...

A compact ultra-wideband (UWB) bandpass filter (BPF) with narrow notched (rejection) band in the UWB passband realized on a microstrip line is implemented and presented this letter for use wireless communication applications within unlicensed range set by Federal Communications Commission (FCC). The consists of five short-circuited stubs separated nonredundant connecting lines order to exhibit high selectivity filtering characteristic. was introduced using new technique which involves...

A novel type of dual-mode microstrip bandpass filter using degenerate modes a meander loop resonator has been developed for miniaturization high selectivity narrow-band microwave filters. this having 2.5% bandwidth at 1.58 GHz was designed and fabricated. The measured performance is presented.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">&gt;</ETX>

This paper presents the design of a class highly selective microstrip bandpass filters that consist open-loop resonators exhibit single pair attenuation poles at finite frequencies. A practical technique for this is introduced, including tables and formulas accurate fast filter synthesis. Two examples six-pole with fractional bandwidth 7.331% 955 MHz an eight-pole 10.359% 985 are described. Theoretical experimental results presented. The compact size excellent performance have been demonstrated.

A new class of cross-coupled planar microwave filters using microstrip hairpin resonators is introduced. The realization bath the canonical and cascaded quadruplet (CQ) feasible. Coupling characteristics four basic coupling structures encountered in this are investigated light full-wave electromagnetic (EM) simulations. four-pole filter type designed fabricated. Both theoretical experimental performance presented.

A new type of dual-mode microstrip square loop resonator is proposed for the design compact microwave bandpass filters. The associated characteristics mode splitting are described. novel filter, consisting such a having 1.2% bandwidth at 1.52 GHz was designed and fabricated. measured filter performance presented.

A novel, compact, and highly selective ultra-wideband bandpass filter was developed on a microstrip line presented in this letter for use wireless communication applications. The basic is composed of five short-circuited stubs separated by nonredundant connecting lines that contribute to the selectivity as well. In addition, cross-coupling between feed (input output) introduced which generated new pairs attenuation poles at each side passband. As result, exhibited extremely sharp rejection...

Wide-band branch-line couplers are designed and tested. The proposed feature compact size on a single circuit layer structure without via-holes. For the broad-band property cost effectiveness, we have four-branch hybrid with mixed distributed lumped elements. Analysis equivalent circuits was performed carefully in order to obtain sufficient bandwidth reduced design area. fabricated hybrids fractional larger than 56% at center frequency of 2 GHz. They also show reduction up 55.2% compared...

A novel ultra wideband (UWB) bandpass filter is presented, using a compact coupled microstrip/coplanar waveguide (CPW) structure. The comprises of single CPW quarter-wavelength resonator which to two microstrip open-circuited stubs on the other side common substrate. stubs, are about long at center frequency, can function as resonators with associated coupling arrangement CPW. This forms very three-pole filter. proposed also exhibits quasi-elliptic response, one finite-frequency transmission...

Electronically reconfigurable or tunable microwave filters are attracting more attention for research and development because of their increasing importance in improving the capability current future wireless systems. For instance, emerging ultrawideband (UWB) technology requires use a wide radio spectrum. However, frequency spectrum as resource is valuable limited, so always being used several purposes, which means it full unwanted signals when an operation such UWB system concerned. In...

The ultrawideband (UWB) planar antenna is designed as a circular metallic patch fed by coplanar waveguide (CPW). This provides the impedance bandwidth of wideband response from 2.5 to 12 GHz. To achieve notched characteristics at desirable frequencies, electric ring resonator (ERR) incorporated into CPW feedline proposed for use in configuration UWB antenna. frequency band controlled dimensions ERR structure. single-notched can be obtained placing single beneath For implementation multinotch...

In this letter, a novel microstrip parallel-coupled line structure with two asymmetric loading stubs is proposed for notched band implementation in ultra-wideband (UWB) bandpass filter (BPF). The rejection introduced by adding to the outer arms of three lines. lengths and widths can control bandwidth set at desired frequency. This has been applied single-stage UWB BPF order produce narrow inside its passband. design successfully realized theory verified full-wave electromagnetic simulation...

An ultra-wideband (UWB) microstrip filter with a fractional bandwidth (FBW) of more than 100% is designed and demonstrated. This UWB microstrip-filter design based on circuit model for an optimum short-circuited stub transmission-line whose unit elements or connecting lines are nonredundant. A comparison study carried out to show the advantages this type versus conventional design, redundant. The theoretical, simulated, experimental results presented. © 2005 Wiley Periodicals, Inc. Microwave...

This paper presents a new type of varactor-tuned dual-mode bandpass filter. Since the two operating modes (i.e., odd and even modes) in microstrip open-loop resonator do not couple to each other, tuning passband frequency becomes simple with single dc-bias circuit while keeping nearly constant absolute bandwidth. Design equations procedures are derived, two-pole tunable filters this demonstrated experimentally.

This article presents an introduction of recently developed techniques for the design and implementation UWB bandpass filters, including single-layer multilayer technologies. Several using technology were reported on, MMR technique, hybrid microstrip/CPW optimum short-circuited-stub cascaded highpass/lowpass filter technique that use EBG-loaded structures.

Novel ultra-wideband (UWB) bandpass filters are proposed based on quasi-lumped-element prototypes and implemented with multilayer liquid-crystal-polymer (LCP) technology. In this study, the broadside-coupled microstrip radial stubs high-impedance lines adopted as quasi-lumped elements for realizing compact UWB filters. By introducing a short-circuited line shunt inductor suitably designing capacitors, six-pole filter is Federal Communications Commission (FCC) defined specifications. To...

The rapid growth of wireless and mobile communications has stimulated the development multilayer filter technology. In this paper, two types aperture-coupled microstrip open-loop resonators in a structure are proposed investigated for applications to design new class compact bandpass filters. configuration consists arrays that ran be coupled through apertures on common ground plane. Depending arrangement apertures, different filtering characteristics can easily realized. Electromagnetic...

A general circuit configuration for cross-coupled wideband bandstop filters is proposed. The distinct filtering characteristics of this new type transmission line filter are investigated theoretically and experimentally. It shown that a ripple stopband can be created, leading to quasi-elliptic function response enhances the rejection bandwidth. demonstrator with approximately 80% fractional bandwidth at mid-stopband frequency 4 GHz developed presented. proposed successfully realized in...

A novel ultra-wideband (UWB) bandpass filter that is capable of integrating multiple notch bands proposed in this paper. multilayer nonuniform periodical structure, which can generate transmission zeros, deployed the design to improve selectivity and upper stopband performance filter. Short-circuited stub resonators are then integrated obtain bands. The compact footprint achieved. UWB filters type without a with single-, double-, triple-notch designed meet Federal Communications...

A new type of reconfigurable asymmetric frequency response bandpass filter using dual-mode open-loop resonator is investigated. It explores the unique characteristic whose two operating modes, i.e., even- and odd-modes do not couple. Thus, tuning passband accomplished by merely changing modal frequencies proportionally, which makes electronic simple. Furthermore, for a single this type, its selectivity can be electronically reconfigured to exhibit higher with finite-frequency transmission...